Steam-boiler



(No Model.) H. S. PELL.

STEAM BOI-LEB.,

N0. 518,858. Patented Aplnll, 1894.

'me NATIONAL UmoanAPNmu COMPANY. wwwwwwwwww n. o.

NITED STATES PATENT OFFICE.

HARRY s. PELL, or AKRON, OHIO, AssIeNoR To THE srIRLINe COMPANY,

l or OHIOAeo, ILLINOIS.

SPECIFICATION :formingI part of Letters Patent N o. 518,858, dated April24, 1894.

Application filed Deco/inter 22, 1893. Serial No. 4941405- (No mofleL).To a/ZZ whontjt may concern:

Be it known thatI, HARRY S. PELL, a citizen of the United States,residing at Akron,

Ohio, have invented certain new and useful Improvements inSteam-Boilers, of which the following is a specication.

The object of my invention has more particular reference to tubularsteam boilers of the general type shown and described in the Stirlingpatent, No. 479,678, issued July 26, 1892; and my invention consists inthe features and details of construction hereinafter described andclaimed.

The drawing represents a transverse ver-V tical section of my improvedtubular boiler.

In making my improved steam boiler, I

make a tire chamber, A, of the desired-size,

and cover it with an arch, a. I arrange water and steam drums, B and Band B2, in the upper part of the boiler, and connect the first two ofthem with water pipes, b, and steam pipes, b', which steam pipes arealsoused Vto connect the last two of the drums mentioned. I arrange inthelower part of the boiler a drum, C, which is intended to be connectedwith and suspended from the three upper drums mentioned by a series oftubes, c, so as to afford communication between them. Deiiecting plates,c and c', are arranged behind the series of tubes connecting the drum,C, and the drums, B and B, so as to deflect the heat and products ofcombustion upward through the one series of tubes and down through theother, as indicated by arrows, in order to expose as great a portion oftheir length as practicable to the heat.

Up to this point, I have simply described in general terms theconstruction Ishown in the Stirling patent referred to, except in thematter of suspending the lower drum, and reference may be had to suchpatent forA amore minute and detailed description of the constructionand operation of the parts.

While using these parts which are found in the Stirling construction, Ivdo not, however, lead the heat and products of combustion directly fromthe last series of tubes up and out through the smoke stack; but arrangea wall or deiiecting plate,I), at the back of the last series of tubes.I/Vherek a deliecting plate is used, I prefer to have it end a suicientdistance below the upper drum, B2, so as to afford space for the heatand products of combustion to be drawn up and over its upper edge.Behind this deilecting plate, I arrange a lower feed water drum, E,which is connected tothe upper drum, B2, by a series of tubes, e, andwhich is provided with a pipe, e', leading from a source of water supplyand a blow-off pipe, e2. As shown in the drawing, I have provided theboiler with an underground connection, F, leading to the chimney orsmoke stack, although other means for carrying off the smoke andproducts of combustion may be employed if desired.

In operation, the water from the source of supply enters the lower feedwater drum through the pipe, e'. This drum is intended to receive andcatch the larger portion of -the sediment that may be contained in thewater, which sediment may from time to time be carried OE through thepipe, e2. The water passes up through the series of tubes, e, into thesteam `and Water drum, B2. This drum communicates through the pipe, b',with the steam and water drum, B', so that its upper portion is lledwith steam exerting a pressure on the surface of the water, so as tocause its more ready feeding into the other drums of the boiler. Thewater passes down from the drum, B2, into the lower drum, C, `and thenup through the series of tubes connecting such drum with the upper steamand water drums, B and B. These drums, as before explained, have steamand water communication with each other, so that a circulation of theWater through the drums, Band B and C, is constantly maintained. notnecessary, however, that this circulation be so direct as to prevent thewater from passing through the mud drum in its circulation from oneelevated drum to another. Nor is it necessary that all the steam orWater pass from one drumto another.

I regard the lower feed drum as a material and important feature of myinvention. By causing the heavier impurities in the Water to settlebefore reaching the elevated drums, it assists in preventing theformation of scaletherein and in the middle and forward banks of tubes;and by utilizing escaping gases it enables me to economize in fuel,

It isl IOO and, generally, assists in securing an economical operationof the boiler.

WhatI regard as new, and desire to secure by Letters Patent, is

1. In a Water tube boiler, the combination of elevated drums havingsteam and Water communication with each other,a lower mud drum, tubesconnecting the elevated drums with the lower mud drum,alower feed drum,tubes connecting the lower feed drum with one of the elevated drums, andmeans for supplying water to the lower feed drum, substantially asdescribed.

2. In a water tube boiler, the combination of three elevated steam andwater drums, B

and B and B2, a lower drum, C, series of tubes connecting the lower drumwith each of the elevated drums, pipes affording steam and Watercommunication between the drums B and Band steam communication betweenthe drums B and B2, a lower feed water drum, E, a series of tubesconnecting the lowerfeed water drum, E, with the elevated steam andwater drum, B2, and means for supplying Water to the lower feed waterdrum, substantially as described.

' HARRY S. PELL. Witnesses:

P. HANSEN, A. R. HENRY.

